// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_EVENTS_EVENT_SOURCE_H_
#define UI_EVENTS_EVENT_SOURCE_H_

#include <vector>

#include "base/macros.h"
#include "ui/events/event_dispatcher.h"
#include "ui/events/events_export.h"

namespace ui {

class Event;
class EventProcessor;
class EventRewriter;

// EventSource receives events from the native platform (e.g. X11, win32 etc.)
// and sends the events to an EventProcessor.
class EVENTS_EXPORT EventSource {
public:
    EventSource();
    virtual ~EventSource();

    virtual EventProcessor* GetEventProcessor() = 0;

    // Adds a rewriter to modify events before they are sent to the
    // EventProcessor. The rewriter must be explicitly removed from the
    // EventSource before the rewriter is destroyed. The EventSource
    // does not take ownership of the rewriter.
    void AddEventRewriter(EventRewriter* rewriter);
    void RemoveEventRewriter(EventRewriter* rewriter);

protected:
    EventDispatchDetails SendEventToProcessor(Event* event);

private:
    friend class EventSourceTestApi;

    EventDispatchDetails DeliverEventToProcessor(Event* event);

    typedef std::vector<EventRewriter*> EventRewriterList;
    EventRewriterList rewriter_list_;
    DISALLOW_COPY_AND_ASSIGN(EventSource);
};

} // namespace ui

#endif // UI_EVENTS_EVENT_SOURCE_H_
